Shuttle kiln and kiln car circulating system combined production line

Abstract

The utility model discloses a shuttle kiln and kiln car circulating system combined production line which comprises a condensation arsenic collection system, a flue gas treatment system, a hot blast stove and shuttle kilns, and the shuttle kilns are arranged side by side at intervals. The top of the shuttle kiln is respectively connected with an exhaust system and an air inlet system, the exhaust system is gathered and connected to the condensation arsenic collection system, the condensation arsenic collection system is connected with the flue gas treatment system, the flue gas treatment system is connected with the hot blast stove, and the air inlet system is gathered and connected to the hot blast stove. The device has the advantages that the heat utilization rate is improved, the energy consumption is reduced, and the arsenic extraction efficiency and the yield are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of harmless treatment of waste gases, in particular to a production line combining a shuttle kiln and a kiln car circulation system. Background Art

[0002] Since arsenic is highly toxic, how to deal with arsenic waste has always been one of the waste gas treatment issues that my country is concerned about. Among them, the best treatment method for arsenic waste arsenic is to recycle and refine arsenic into arsenic products, and it has been applied. In the production method and equipment for extracting arsenic from arsenic-containing flue gas in smelting, continuous operation equipment is used, in which an airtight rotary kiln is used as a calcination volatilization kiln, and the heating method can be electric heating to achieve uniform external heating. When the crushed powder of arsenic waste is placed in a rotary kiln and heated to a certain temperature, As2O3 volatilizes into the gas and is discharged from the kiln, and solid substances such as sulfates are discharged from the tail of the kiln. The generated flue gas is condensed and recycled through a flue gas recovery system, and then reduced to As2O3 to extract elemental arsenic.

[0003] However, if the above-mentioned arsenic extraction process needs to be mass-produced, if a production line consisting of multiple rotary kilns is directly established, since each rotary kiln is heated by an external heating wire, when undergoing the processing steps of normal temperature-drying 160℃-reduction 450℃-sublimation 750℃-cooling 30℃, the working temperature of the heating wire changes from cold-high temperature-cold, there is a problem of low heating wire utilization rate and high comprehensive maintenance cost. Moreover, the flue gas in the cooling stage after each high temperature is directly discharged without being used, resulting in energy waste and being unfavorable to environmental protection. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the utility model is to provide a production line combining a shuttle kiln and a kiln car circulation system, which can improve heat utilization, reduce energy consumption, and improve the efficiency of arsenic extraction.

[0005] In order to solve the above technical problems, the embodiment of the utility model provides a production line combining a shuttle kiln and a kiln car circulation system, including a condensation arsenic collection system, a flue gas treatment system, a hot blast furnace and a shuttle kiln, wherein the shuttle kiln is arranged in parallel and at intervals;

[0006] The top of the shuttle kiln is respectively connected with an exhaust system and an air intake system, the exhaust system is collected and connected to the condensation arsenic collection system, the condensation arsenic collection system is connected to the flue gas treatment system, the flue gas treatment system is connected to the hot blast furnace, and the air intake system is collected and connected to the hot blast furnace;

[0007] The condensation arsenic collection system is used to collect arsenic in flue gas by condensation;

[0008] The flue gas treatment system is used to desulfurize the kiln tail gas after it flows through the condensation arsenic collection system.

[0009] Preferably, the air intake system is provided with heat supply mains corresponding to the drying stage, reduction stage, sublimation stage and cooling stage and air supply fans of the stages, and each heat supply main is provided with a first regulating valve at the place where it is connected to each shuttle kiln, and the exhaust system is provided with a mixing flue in the circulation stage and an exhaust main in the low-temperature dehumidification stage, and the mixing flue and the exhaust main are each provided with a second regulating valve at the place where they are connected to each shuttle kiln.

[0010] Preferably, the production line combining the shuttle kiln and the kiln car circulation system further comprises a nitrogen supplement system, and the nitrogen supplement system is connected to the flue gas treatment system.

[0011] Preferably, the production line of the shuttle kiln and kiln car circulation system combination also includes a transmission track, and kiln car channels are provided in the shuttle kiln along the length direction, and the kiln car channels are connected to the transmission track, and a first trailer is slidably connected to the transmission track.

[0012] Preferably, the transfer track is arranged perpendicular to the length direction of the shuttle kiln.

[0013] Preferably, the transmission track is also connected to a spare track and a spare kiln car slidably connected to the spare track.

[0014] Preferably, the production line of the shuttle kiln combined with the kiln car circulation system further includes a car repair track, and the car repair track is connected to the transmission track.

[0015] Preferably, the production line of the shuttle kiln combined with the kiln car circulation system further comprises an external kiln unloading track and an external kiln loading track arranged in parallel, and the external kiln unloading track and the external kiln loading track are both connected to the transmission track.

[0016] Preferably, the production line combining the shuttle kiln and the kiln car circulation system further comprises a kiln unloading area close to the unloading track outside the kiln, and a kiln loading area close to the loading track outside the kiln.

[0017] Preferably, the production line of the shuttle kiln and kiln car circulation system combination further includes a transfer track, the kiln external unloading track and the kiln external loading track are both connected to the transfer track, and a second trailer is slidably connected to the transfer track.

[0018] Implementing the embodiments of the utility model has the following beneficial effects:

[0019] The utility model arranges shuttle kilns in parallel and at intervals, and according to the conventional arsenic extraction process temperature curve, each shuttle kiln works in turn under different temperature conditions to improve heat utilization and reduce energy consumption;

[0020] Among them, the top of the shuttle kiln is respectively connected to an exhaust system and an air intake system, the exhaust system is collected and connected to the condensation arsenic collection system, the condensation arsenic collection system is connected to the flue gas treatment system, the flue gas treatment system is connected to the hot blast furnace, and the air intake system is collected and connected to the hot blast furnace, so that the flue gas in the drying, reduction, sublimation and cooling stages of each shuttle kiln is uniformly collected to the exhaust system, and after passing through the condensation arsenic collection system and the flue gas treatment system, it is mixed with the working heat of the heating wire of the hot blast furnace according to the different temperature requirements of the shuttle kiln and distributed for use through the air intake system, thereby improving the efficiency of arsenic extraction while further reducing energy consumption and improving heat utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of one embodiment of a production line combining a shuttle kiln and a kiln car circulation system of the utility model;

[0022] Figure 2 It is a structural diagram of another embodiment of a production line combining a shuttle kiln and a kiln car circulation system according to the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail with reference to the accompanying drawings. It is hereby stated that the directional words such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the utility model are only based on the accompanying drawings of the utility model, and are not specific limitations of the utility model.

[0024] Combination Figure 1 and Figure 2 , one embodiment of the utility model provides a production line combining a shuttle kiln 1 and a kiln car circulation system, including a shuttle kiln 1, a condensation arsenic collection system 2, a flue gas treatment system 3 and a hot blast furnace 4;

[0025] The utility model arranges shuttle kilns 1 in parallel and at intervals. According to the conventional arsenic extraction process temperature curve, each shuttle kiln 1 works in turn under different temperature conditions to improve heat utilization and reduce energy consumption.

[0026] The top of the shuttle kiln 1 is connected with an exhaust system 51 and an air intake system 52, respectively. The exhaust system 51 is collected and connected to the condensation arsenic collection system 2, the condensation arsenic collection system 2 is connected to the flue gas treatment system 3, the flue gas treatment system 3 is connected to the hot blast furnace 4, and the air intake system 52 is collected and connected to the hot blast furnace 4. The condensation arsenic collection system is used to collect arsenic in the flue gas by condensation; the flue gas treatment system is used to desulfurize the kiln tail gas after passing through the condensation arsenic collection system. The flue gas in the drying, reduction, sublimation and cooling stages of each shuttle kiln 1 is uniformly collected to the exhaust system 51. After passing through the condensation arsenic collection system 2 and the flue gas treatment system 3, the flue gas is mixed with the working heat of the heating wire of the hot blast furnace 4 according to the different temperature requirements of the shuttle kiln 1, and then distributed and used through the air intake system 52, thereby improving the efficiency of arsenic extraction, further reducing energy consumption and improving heat utilization.

[0027] Specifically, the condensation arsenic collection system is a tank body made of stainless steel. After the arsenic-containing flue gas is introduced into the stainless steel tank body, the arsenic-containing oxide (arsenic trioxide) is cooled and precipitated in the tank body and accumulated at the bottom of the tank body. When accumulated to a certain extent, the solid powder is sent out from the outlet at the bottom of the tank body. The main body of the flue gas treatment system is a desulfurization tower commonly seen in existing tail gas treatment equipment. After the flue gas enters the desulfurization tower, it is desulfurized and a corresponding volume of nitrogen is introduced to ensure that the total flue gas volume remains unchanged before and after desulfurization. After the flue gas is desulfurized, the sulfur content of the flue gas re-introduced into the kiln can be reduced, so as to avoid excessive sulfur content in the flue gas from corroding various pipelines and equipment in the production line and prolong the service life of the equipment.

[0028] Furthermore, the air intake system 52 is respectively provided with heat supply mains corresponding to the drying stage, reduction stage, sublimation stage and cooling stage and air supply fans of the stages, and each heat supply main is provided with four first regulating valves corresponding to the four stages at the place where it is connected to each shuttle kiln. The exhaust system is respectively provided with a mixing flue for the circulation stage and an exhaust main for the low-temperature dehumidification stage, and the mixing flue and the exhaust main are respectively provided with a second regulating valve at the place where they are connected to each shuttle kiln, so that each shuttle kiln 1 can reach the process cycle temperature required for its stage by respectively adjusting the heating air, circulation and exhaust regulating valves of each stage of each shuttle kiln 1, thereby further improving the heat utilization rate and reducing energy consumption.

[0029] As one of the embodiments, the shuttle kilns 1 are arranged in sequence as 1# shuttle kiln, 2# shuttle kiln, 3# shuttle kiln, 4# shuttle kiln and 5# shuttle kiln. Each shuttle kiln 1 includes 5 stages from startup to normal operation: 24 hours of drying stage, 24 hours of reduction stage, 24 hours of sublimation stage, 24 hours of cooling stage and 24 hours of loading and unloading kiln stage. According to continuous production calculation, one shuttle kiln 1 is in the loading and unloading kiln state every day. The stage states of the five shuttle kilns 1 are as follows:

[0030] Working day 1: Shuttle kiln #1 is being loaded; shuttle kilns #2-5 are waiting to be loaded;

[0031] The second working day: Shuttle kiln #1 is drying; shuttle kiln #2 is loading; shuttle kilns #3-5 are waiting to be loaded;

[0032] Working day 3: Shuttle kiln #1 is being restored; shuttle kiln #2 is being dried; shuttle kiln #3 is being loaded; shuttle kilns #4-5 are waiting to be loaded;

[0033] Working day 4: Shuttle kiln #1 is sublimating; shuttle kiln #2 is reducing; shuttle kiln #3 is drying; shuttle kiln #4 is loading; shuttle kiln #5 is waiting to be loaded;

[0034] Working day 5: Shuttle kiln #1 is cooling down; Shuttle kiln #2 is sublimating; Shuttle kiln #3 is reducing; Shuttle kiln #4 is drying; Shuttle kiln #5 is loading;

[0035] Working day 6: Shuttle kiln 1# is unloading and loading; shuttle kiln 2# is cooling; shuttle kiln 3# is sublimating; shuttle kiln 4# is reducing; shuttle kiln 5# is drying;

[0036] Working day 7: Shuttle kiln #1 is drying; shuttle kiln #2 is unloading and loading; shuttle kiln #3 is cooling; shuttle kiln #4 is sublimating; shuttle kiln #5 is reducing;

[0037] Through the above process, each shuttle kiln 1 rotates through different stages every day according to the process cycle sequence, and so on, to achieve continuous production. The arsenic-containing flue gas volatilized by heat in each shuttle kiln 1 flows through the kiln top exhaust system 51 through the condensation arsenic collection system 2 and the flue gas treatment system 3, thereby continuously circulating and extracting arsenic.

[0038] Preferably, in order to ensure the pressure balance of the flue gas treatment system 3, the production line combining the shuttle kiln 1 and the kiln car circulation system also includes a nitrogen supplement system 6, which is connected to the flue gas treatment system 3 to supplement nitrogen to maintain the pressure balance of the kiln top hot air circulation system.

[0039] On the other hand, combined again Figure 1 and Figure 2 In order to realize the transmission function, the production line of the shuttle kiln 1 and the kiln car circulation system also includes a transmission track 7. The shuttle kiln 1 is provided with kiln car channels 11 along the length direction. Each of the kiln car channels 11 is connected to the transmission track 7. A first trailer 71 is slidably connected to the transmission track 7, so that the kiln car loaded with arsenic-containing porous bricks is delivered to the vacant shuttle kiln 1 through the first trailer 71.

[0040] When the porous bricks are processed, the kiln car loaded with the processed porous bricks is again transported to the outside of the shuttle kiln 1 by the first trailer 71 to unload the processed porous bricks.

[0041] Preferably, the transfer track 7 is arranged perpendicular to the length direction of the shuttle kiln 1 so that the transfer track 7 is connected to each kiln car channel 11 .

[0042] More preferably, in order not to affect normal production, the transport track 7 is also connected with a spare track 72 and a spare kiln car 73 slidably connected to the spare track 72 to replace the kiln car damaged during transportation. More preferably, the transport track 7 is also connected with a repair track 74, and the kiln car damaged during transportation can be transported to the repair track 74 by the first trailer 71 for repair, and the spare kiln car 73 can be used to replace it.

[0043] In addition, to realize the loading and unloading function, the production line of the shuttle kiln 1 combined with the kiln car circulation system further includes a kiln unloading track 81 and a kiln loading track 82 arranged in parallel, and the kiln unloading track 81 and the kiln loading track 82 are both connected to the transmission track 7. Further, the production line of the shuttle kiln 1 combined with the kiln car circulation system further includes a kiln unloading area 83 close to the kiln unloading track 81, and a kiln loading area 84 close to the kiln loading track 82.

[0044] As one of the embodiments, after entering the kiln, each kiln car loaded with arsenic-containing porous bricks is transported to the kiln unloading area 83 on the unloading track 81 outside the kiln by the first trailer 71 parked in front of the kiln, so as to unload the processed porous bricks on the car;

[0045] Subsequently, the empty kiln car is transferred by the second trailer to the kiln loading area 84 on the loading track 82 outside the kiln to load new arsenic-containing porous bricks, and the fully loaded kiln car is then sent back to the empty shuttle kiln 1 via the first trailer 71 in front of the kiln to ensure processing efficiency.

[0046] Preferably, the production line combining the shuttle kiln 1 and the kiln car circulation system also includes a transfer track 85, and the unloading track 81 outside the kiln and the loading track 82 outside the kiln are both connected to the transfer track 85, and a second trailer 86 is slidably connected to the transfer track 85, so that the empty kiln car located on the unloading track 81 outside the kiln can be transferred to the loading track 82 outside the kiln via the transfer track 85 through the second trailer 86, so as to load new arsenic-containing porous bricks in the kiln loading area 84.

[0047] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A production line combining a shuttle kiln and a kiln car circulation system, characterized in that: It includes a condensation arsenic collection system, a flue gas treatment system, a hot blast furnace and a shuttle kiln, wherein the shuttle kiln is arranged in parallel and at intervals; The top of the shuttle kiln is respectively connected with an exhaust system and an air intake system, the exhaust system is collected and connected to the condensation arsenic collection system, the condensation arsenic collection system is connected to the flue gas treatment system, the flue gas treatment system is connected to the hot blast furnace, and the air intake system is collected and connected to the hot blast furnace; The condensation arsenic collection system is used to collect arsenic in flue gas by condensation; The flue gas treatment system is used to desulfurize the kiln tail gas after it flows through the condensation arsenic collection system.

2. The production line of the shuttle kiln and kiln car circulation system as claimed in claim 1, characterized in that: The air intake system is respectively provided with heat supply pipes corresponding to the drying stage, reduction stage, sublimation stage and cooling stage and air supply fans of the respective stages, and each heat supply pipe is provided with a first regulating valve at the location where it is connected to each shuttle kiln; the exhaust system is respectively provided with a mixing flue in the circulation stage and an exhaust pipe in the low-temperature dehumidification stage, and the mixing flue and the exhaust pipe are respectively provided with a second regulating valve at the location where they are connected to each shuttle kiln.

3. The production line of the shuttle kiln and kiln car circulation system as claimed in claim 1, characterized in that: The production line combining the shuttle kiln and the kiln car circulation system also includes a nitrogen supplement system, and the nitrogen supplement system is connected to the flue gas treatment system.

4. The production line of the shuttle kiln and kiln car circulation system as claimed in claim 1, characterized in that: The production line of the shuttle kiln and kiln car circulation system combination also includes a transmission track. Kiln car channels are provided in the shuttle kiln along the length direction. The kiln car channels are connected to the transmission track, and a first trailer is slidably connected to the transmission track.

5. The production line of the shuttle kiln and kiln car circulation system as claimed in claim 4, characterized in that: The transmission track is arranged perpendicular to the length direction of the shuttle kiln.

6. The production line of the shuttle kiln combined with the kiln car circulation system as claimed in claim 4, characterized in that: The transmission track is also connected with a spare track and a spare kiln car slidably connected to the spare track.

7. The production line of the shuttle kiln combined with the kiln car circulation system as claimed in claim 4, characterized in that: The production line of the shuttle kiln and kiln car circulation system combination also includes a car repair track, which is connected to the transmission track.

8. The production line of the shuttle kiln combined with the kiln car circulation system as claimed in claim 4, characterized in that: The production line of the shuttle kiln and kiln car circulation system combination also includes a kiln unloading track and a kiln loading track arranged in parallel, and the kiln unloading track and the kiln loading track are both connected to the transmission track.

9. The production line of the shuttle kiln combined with the kiln car circulation system according to claim 8, characterized in that: The production line of the shuttle kiln combined with the kiln car circulation system also includes a kiln unloading area close to the unloading track outside the kiln, and a kiln loading area close to the loading track outside the kiln.

10. The production line of the shuttle kiln combined with the kiln car circulation system according to claim 8, characterized in that: The production line of the shuttle kiln and kiln car circulation system combination also includes a transfer track, the kiln external unloading track and the kiln external loading track are both connected to the transfer track, and a second trailer is slidably connected to the transfer track.

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